Product Guide

E810/M2S+ADJ

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Two-Stage Robust Thermostatwith remotely activated set-backand user-adjustable setpoint(modified 2nd stage functionality)

energy saving controls

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Product Overview

The E810/M2S+ADJ is a 2-stage thermostat with a remotely controlled set-back functionality and user-adjustable setpoint, offering a high quality and robust solution to tamperproof energy-saving thermostatic control. It utilises a high-accuracy radiant heat sensor in conjunction with its die-cast aluminium case and tamperproof screws to ensure vandal-resistant yet accurate tamperproof energy control.

The E810/M2S+ADJ regulates to a fully adjustable temperature Setpoint between +16°C and +26°C, combined with an adjustable temperature hysteresis (differential) of anything between 0.25°C and 4°C. The temperature Sepoint is fully adjustable by the end-user up to a pre-defined maximum temperature which is selected at installation. This provides satisfaction to the end-user in that they believe they have full control over the room temperature but also provides significant savings to the bill payer from the fact that they are able to permanently limit the maximum temperature the end-user is capable of selecting. Additionally an adjustable Set-Back (°C back from the Setpoint) of up to 14°C can be applied. A PIR motion sensor or timeclock is typically used to activate the remote input which selects between the Setpoint or Set-Back temperatures (‘High’ when the switch is closed and ‘Low’ when the switch is open). This ensures the room temperature is regulated to a comfortable level when it is occupied yet significantly reduces heating energy consumption when the room is empty.

2-stage functionality is used to select between two different fan speeds when the E810/M2S controls the heating device (often a multi-speed fan convector). The High fan speed is activated upon the thermostat detecting the remote switch being closed, such as when the room first becomes occupied. This allows the room temperature to boost up to the target level quickly using the High fan speed. Once the target temperature is reached the fan is turned Off and the Low fan speed is selected thereafter to keep the room temperature constant. See Figure 1 for a graphical representation.

This 2-stage functionality ensures the room temperature quickly raises when it becomes occupied or a specific time of day is reached, and will then switch to a much quieter mode of operation once the room temperature is up to the desired level, or the room becomes unoccupied. This functionality makes the 2-stage thermostat ideally suited to areas such as classrooms where a quick initial response is required, but quiet operation is required thereafter.

Figure 1 Functionality Diagram

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Figure 2 Typical Wiring Diagram

Product Wiring

1. IMPORTANT: ensure all electrical connections are isolated before commencing any work on the unit.

2. Power to the thermostat is provided via the Live and Neutral input terminals labelled “L” and “N” (85V - 265V AC, 50 - 60Hz).

3. NOTE: This thermostat MUST be earthed using the earth terminal provided.4. Two voltage-free relay outputs capable of switching loads of up to 10A, 250V AC (resistive) are

provided by the thermostat for controlling a fan convector.5. The “FAN” terminal is connected to the “HI” terminal when the thermostat has selected the High

fan speed, conversely, it is connected to the “LO” terminal when the Low fan speed is selected.6. The “COM” terminal is connected to the “TX” terminal when the fan is to be On, conversely it is

disconnected when the fan is to be Off.7. The “Remote Switch” input selects the ‘High’ Set-Back mode when it is closed and the ‘Low’

Set-Back mode when it is open. Do not apply any external voltage to this contact!8. The temperature sensor is factory fitted to all models with the exception of the Remote Sensor

(/RS) versions. A 2-core screened cable connection should be made to the “Temp. Sensor” terminals on /RS versions, with the screen connected to the thermostat Earth terminal only.

Installation

1. IMPORTANT: ensure all electrical connections are isolated before commencing any work on the unit.

2. Unscrew the 4 security screws using M.S. Electronics tamperproof screwdriver MSD-152 to remove the front cover. Disconnect the wire at the in-line connector to completely remove the lid.

3. Mount the unit securely using any suitable fixing in conjunction with the mounting holes provided in the unit. For optimal results, position the temperature sensor out of direct sunlight and well away from any heating/cooling sources.

4. Using Figures 2 to 5 as a guide, connect the wiring in a suitably appropriate form with the convenient pluggable terminal blocks provided. Contact Technical Support with the heater make and model number for specific help if a suitable wiring method is unclear.

5. On the remote sensor version, 2-core screened cable should be used to connect the remote sensor to the thermostat. The screen should be connected to the earth terminal ONLY (do not connect the screen to anything at the remote sensor end).

6. Adjust the internal controls to suit the operational requirements (see the ‘Operation’ section).7. Re-connect the in-line connector and replace the cover securely using the 4 security screws.

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Typical Fan Convector Wiring Examples

The diagrams in Figures 3 to 5 illustrate a few generic methods of how to electrically connect the thermostat to a multi-speed fan convector. If you are unsure which of the below diagrams is most suited to your application, please contact our Technical Support team with the specific make an model of heater for further assistance.Note: The heater may have more than 2 speeds, however the E810/M2S+ADJ can only control a maximum of 2 speeds (plus ‘Off’). When selecting the low fan speed, ensure that in the worst case there is still sufficient heat output to maintain the desired room temperature. A medium speed may need to be selected for the low speed in some cases.

Figure 3: Hot water fan convector (a)

The transformer and the fan are in the same module.The thermostat routes the Live supply to the correct speed selection terminal on the heater.

Figure 4: Hot water fan convector (b)

The transformer and the fan are in separate modules.The transformer has different speed outputs. The thermostat routes the correct speed directly to the fan.

Figure 5:

Rather than changing fan speeds the thermostat correctly selects either 1 heating element + fan, or 2 heating elements + fan.

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Operation

1. IMPORTANT: ensure all electrical connections are isolated before commencing any work on the unit.

2. Set the “Differential” to the total temperature swing either side of the “Setpoint” that the room temperature is required to keep within (typically 1°C).

3. Adjust the “Setback” to the temperature below the HIGH “Setpoint” to obtain the desired temperature in LOW mode.

4. Adjust the “Setpoint Max” dial to the the maximum room temperature the end-user is allowed to select.

Example of a typical set-up: Differential” set to 1ºC, “Setback” set to 4ºC and Setpoint Max set to 23ºC. HIGH mode (Remote Switch input CLOSED) (RED LED): The end-user will be able to select any temperature between 16ºC and 23ºC. The room temperature will be maintained at the selected temperature +/- 0.5ºC. The High fan speed will be selected upon first entering this mode. The Low fan speed will be selected once the target temperature is reached. LOW mode (Remote Switch input OPEN) (GREEN LED): The room temperature will be maintained 4ºC below the user-selected temperature. The Low fan speed will always be selected in this mode.

Technical SpecificationPower supply: 85V - 265V AC 50 - 60Hz (live/neutral/earth)Output switch rating: 10A, 250V AC (resistive)

Output switch type: On/Off: Single contact relay (volt-free) High/Low: Changeover relay (volt-free)

Temperature control: [high Setpoint]: +12°C to +26°C [low Setpoint]: 0°C to 14°C below the high Setpoint

Temperature differential: 0.25°C to 4°C2-stage control: 2 speeds (High/Low) + OffSensor drift: 0.15°C over 5 yearsGuarantee: 5 YearsWeight: 0.35KgDimensions: 120mm x 95mm x 35mm

Product AccessoriesMSD-152 M.S. Electronics tamperproof screwdriverMSD-150 Air temperature sensor (sensor only)MSD-224 Air temperature sensor (internal, boxed)MSD-370 Air temperature sensor (internal, faceplate)

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MS Electronics reserves the right to alter or change this specification without prior notice.

Technical SupportFor further help or information on this and the other products in the MS Electronics range

visit www.mselectronics.co.uk or call 0333 666 1176.

Alternatively, email techsupport@mselectronics.co.uk Additional copies of this product guide can be downloaded from our website.

Product WarrantyMS Electronics guarantees all their products against manufacturing defects for

5 years from the purchase date. If your product is found to be faulty, MS Electronics will, at their discretion, repair or replace the product free of charge.

NoteAny modification or damage to the outer casing of the product, as well as any

damage to the product due to abuse or incorrect wiring may invalidate the guarantee.

energy saving controls